Language objects
Explicit object exchange and report management
At a Glance
Illustration
When the data is exchanged between the PLC memory and the module, the considl l erations taken by the module may require the running of several task cycles. To manage the exchanges, 2 words are used:
%MWxy.i: Exchange in progress,
%MWxy.i.1: Report.
The illustration below shows the different data bits for managing the exchanges.
Reconfiguration (X15)
Adjustment (X2)
Command (X1)
State (X0)
Status parameters
Command parameters
Adjustment parameters
READ_STS
WRITE_CMD
WRITE_PARAM
READ_PARAM
SAVE_PARAM
RESTORE_PARAM
180
TLX DS 57 PL7 40E 09.2000
Description of the data bits
Language objects
Each of the word bits %MWxy.i and %Mwxy.i.1 is associated with a parameter type: l l l the bits in position 0 are associated with the status parameters: l the bit %Mwxy.i.X0 indicates if a status word read request is in progress, the bits in position 1 are associated with the command parameters: l the bit %Mwxy.i.0:X1 shows whether the command parameters are sent to l channel i of the module, the bit %MWxy.i.1:X1 specifies whether the command parameters are accepted by channel i of the module, the bits in position 2 are associated with the adjustment parameters: l the bit MWxy.i.0:X2 indicates whether the adjustment parameters are exchanged with channel i of the module (by WRITE_PARAM, READ_PARAM, l l
SAVE_PARAM, RESTORE_PARAM), the bit %MWxy.i.1:X2 specifies whether the adjustment parameters are accepted by the module. If the exchange has progressed correctly, the bit changes to 0, the bits in position 15 show a reconfiguration on channel i of the module from the terminal (modification of configuration parameters + cold start of the channel).
Note: The exchange and report words also exist at module level (%MWxy.MOD and %MWxy.MOD.1).
Example Phase 1: Transmitting data with the help of the WRITE_PARAM instruction
PLC memory
Status parameters
Command parameters
1
0
Adjustment parameters
TSX CFY module memory
Status parameters
Command parameters
Adjustment parameters
When the instruction is scanned by the PLC processor, the Exchange in progress bit is set to 1 in %MWxy.
TLX DS 57 PL7 40E 09.2000
181
Language objects
Explicit exchange operation indicators:
%MWxy.i.0
Explicit exchange report:
%MWxy.i.1
Phase 2: Analysis of data by the I/O and report module
PLC memory
Status parameters
Command parameters
0
1
Adjustment parameters
TSX CFY module memory
Status parameters
Command parameters
Adjustment parameters
When the data is exchanged between the PLC memory and the module, the considerations taken by the data module are managed by the bit %MWxy.i.1:X2: Report (0
=correct exchange, 1= unsuccessful exchange).
Note: There are no adjustment parameters at the module level.
The table below shows the meaning of channel exchange check bits EXCH_STS.
1
2
Bit
0
15
Standard symbol
STS_IN_PROGR
Meaning
Channel status word exchange in progress
COMMAND_IN_PROGR Command word exchange in progress
ADJUST_IN_PROGR Adjustment word (parameters) exchange in progress
RECONF_IN_PROGR Channel reconfiguration in progress
The table below shows the meaning of report bits EXCH_ERR.
1
2
Bit
0
15
Standard symbol
STS_READ_ERR
COMMAND_ERR
ADJUST_ERR
RECONF_ERR
Meaning
Failure when reading channel status
Failure when sending a command word
Failure when sending an adjustment word
Failure when reconfiguring the channel
182
TLX DS 57 PL7 40E 09.2000
